Never serve a masked decode from a staged speculation fire #167

Job	Run time
pie-server (driver-portable + metal)	2m 23s
pie-server (driver-portable)	1m 48s
cargo check / test (workspace)	1m 31s
pie-server (driver-dummy) (ubuntu-latest)	1m 20s
pie-server (driver-dummy) (macos-latest)	2m 9s
pie-server (driver-cuda)	-6s
	9m 5s

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